Increasing dietary energy level improves growth performance and lipid metabolism through up-regulating lipogenic gene expression in yak (Bos grunniens)

文献类型： 外文期刊

第一作者： Yang, C.

作者： Yang, C.;Ahmad, A. A.;Bao, P. J.;Guo, X.;Wu, X. Y.;Chu, M.;Liang, C. N.;Pei, J.;Yan, P.;Wang, S. Y.;Ding, X. Z.;Yang, C.;Ahmad, A. A.;Bao, P. J.;Guo, X.;Wu, X. Y.;Chu, M.;Liang, C. N.;Pei, J.;Yan, P.;Wang, S. Y.;Ding, X. Z.;Yang, C.;Liu, J. B.;Ahmad, A. A.;Long, R. J.

作者机构：

关键词： Yak; Dietary energy level; Lipid metabolism; Liver; Subcutaneous adipose tissue

期刊名称：ANIMAL FEED SCIENCE AND TECHNOLOGY （ 影响因子：3.247； 五年影响因子：3.806 ）

ISSN： 0377-8401

年卷期： 2020 年 263 卷

页码：

收录情况： SCI

摘要： This study evaluated the growth performance and gene expression associated with lipid metabolism of liver and subcutaneous adipose tissue in yaks that were fed with three different energy diets i.e., low energy level (LE: 5.50 MJ/kg), medium energy level (ME: 6.20 MJ/kg) and high energy level (HE: 6.90 MJ/kg). Fifteen castrated adult yaks (initial BW 274 +/- 3.14 kg) were used in a completely randomized design, underwent a 14-d adaptation period and the experiment was conducted for 60 d. The final BW, ADG, feed efficiency, carcass weight, dressing percentage and average backfat thickness were significantly higher (P < 0.05) in HE group. Significantly higher plasma concentrations of glucose, triglycerides (TG), cholesterol (CH), high-density lipoprotein (HDL), low-density lipoprotein (LDL), nonesterified fatty acid (NEFA), insulin (INS) and insulinlike growth factor 1 (IGF-1) were recorded in HE group as compared to LE and ME. A higher dietary energy intake resulted in the upregulation of the expression of lipogenic genes i.e., ACACA, FASN, SCD, LPL, PPAR., SREBP-1c, FABP4 and DGAT-1 and activities of their encoding enzymes in liver and subcutaneous adipose tissue, but downregulated the expression of lipolytic genes (HSL, CPT-1, and ATGL) and activities of their encoding enzymes in subcutaneous adipose tissue. We concluded that a higher level of dietary energy intake improved growth performance and fat deposition via up-regulation of lipogenic genes and down-regulation of lipolytic genes in yak.

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